Selection of the composition and parameters of the propulsive complex of increased speed sea transport vessel

2021 ◽  
pp. 109-117
Author(s):  
В.В. Гаврилов ◽  
В.А. Жуков ◽  
Ю.В. Лабзин
Keyword(s):  
Fuel Consumption ◽  
Computer Aided Design ◽  
Efficiency Coefficient ◽  
Container Ship ◽  
Sea Transport ◽  
Marine Transport ◽  
Design Speed ◽  
Transport Vessel ◽  
Aided Design ◽  
Selection Of

В работе предложена методика выбора состава и основных параметров двигательно-движительного комплекса морского транспортного судна, предложены критерии оценки указанного выбора. С использованием этой методики решена задача выбора числа гребных валов при проектировании транспортных судов повышенной скорости хода. Задача решена применительно к судну RO-RO типа «Сергей Киров» (проектная скорость 17 узлов) и контейнеровозу ФЕСКО «Байкал» (проектная скорость 22 узла). В качестве критериев оценки проектных решений использована совокупность величин: пропульсивный коэффициент, часовой расход топлива в главных двигателях и суммарные затраты денежных средств на покупку и эксплуатацию главных двигателей в течение расчётного срока. Второй из перечисленных критериев использован в составе относительного конструктивного коэффициента энергетической эффективности (EEDI), который по сути является величиной, характеризующей уровень выброса СО2 в атмосферу. В работе использован авторский программный комплекс ENGINES автоматизированного проектирования судового пропульсивного комплекса. В программе предусмотрен расчёт ходкости суда, параметров гребного винта, а также выбор из электронного каталога вариантов главного двигателя. Для каждого двигателя выполнена совместная оптимизация параметров гребного винта и рабочей точки двигателя с целью обеспечения минимального часового расхода топлива. Расчёты показали, что граничная проектная скорость движения судна, при превышении которой целесообразен переход от одновальной установки в двухвальной, составляет: для RO-RO – 16 узлов; для контейнеровоза – 25 узлов. The paper proposes a method for selecting the composition and main parameters of the propulsive complex of a marine transport vessel, and suggests criteria for evaluating this choice. Using this technique, the problem of selecting the number of propeller shafts in the design of increased speed transport vessels is solved. The problem is solved in relation to the RO-RO vessel "Sergey Kirov" (design speed 17 knots) and the container ship FESCO "Baikal" (design speed 22 knots). As criteria for evaluating design solutions, a set of values is used: the propulsive coefficient, the hourly fuel consumption in the main engines and the total cost of funds for the purchase and operation of the main engines during the estimated period. The second of these criteria is used as variety of the relative constructive energy efficiency coefficient (EEDI), which is essentially a value that characterizes the level of CO2 emissions into the atmosphere. The paper uses the author's software package ENGINES for computer-aided design of the ship's propulsive complex. The program provides for the calculation of the ship's seaworthiness, the parameters of the propeller, as well as the selection of the main engine from the electronic catalog of options. For each engine, the parameters of the propeller and the operating point of the engine are jointly optimized to ensure a minimum hourly fuel consumption. Calculations have shown that the limit design speed of the vessel, when exceeding which it is advisable to switch from a single-shaft installation to a two-shaft one, is: for RO-RO – 16 knots; for a container ship - 25 knots.

Automated Design of Optimum Belt Drives

1991 ◽  
Author(s):  
Dipendra K. Sinha ◽  
Michael T. McDonald
Keyword(s):  
Computer Aided Design ◽  
Database Management ◽  
Relevant Information ◽  
Automated Design ◽  
Drive System ◽  
Management Systems ◽  
Belt Drives ◽  
Computer Aided ◽  
Aided Design ◽  
Selection Of

Abstract The paper describes a belt design package which works from within a commercial Computer Aided Design and Drafting package (AutoCAD) environment and utilizes FORTRAN programs for design and selection of lowest weight components for the drive system. The components used in the process are available as stock items in U.S.A. The relevant information on these products is stored in commercial database management systems such as EXCEL and LOTUS 1-2-3. Output from the package consists of scaled drawing and tabular specifications.

Design of special tools by CAD/CAM systems

1998 ◽  
Vol 212 (5) ◽  
pp. 357-371
Author(s):  
J C Rico ◽  
S Mateos ◽  
E Cuesta ◽  
C M Suárez
Keyword(s):  
Computer Aided Design ◽  
Automatic Identification ◽  
Automatic Design ◽  
Technological Parameters ◽  
Optimum Cutting ◽  
Cad Cam ◽  
The Cost ◽  
Aided Design ◽  
Cam Systems ◽  
Selection Of

This paper presents a program for the automatic design of special tools developed under a CAD/CAM (computer aided design/manufacture) system. In particular, the special tools made with standard components have been considered. Since the design of these types of tools was essentially related to the selection of their components, this paper deals with this aspect, insisting upon the selection of those components directly related to the removal of material: the toolholders or cartridges and the inserts. To select these components it is necessary to take into account not only geometrical or technological rules but also economical ones, owing to the high amount of possible components they can select. Consideration of economical aspects required the formulation of the cost equation associated with the use of these types of tools, characterized because their cutting edges coincide with different cutting velocities. Likewise, consideration of economical aspects allows the selection of the optimum cutting conditions and the cutting components to take place at the same time. Some of the geometrical and technological parameters related to the selection of cutting components are automatically identified by the system through an automatic identification of the workpiece profile.

Computer Aided Design of Manufacturing of Anchors and Formulation of the Optimization Task for in Use Properties

2013 ◽  
Vol 554-557 ◽  
pp. 372-382
Author(s):  
Mariusz Skóra ◽  
Stanislaw Weglarczyk ◽  
Jan Kusiak ◽  
Maciej Pietrzyk
Keyword(s):  
Computer Aided Design ◽  
Dimensional Accuracy ◽  
Influence Of Process Parameters ◽  
Rheological Models ◽  
Optimization Task ◽  
Multi Stage ◽  
Bainitic Steels ◽  
Computer Aided ◽  
Aided Design ◽  
Selection Of

Computer aided design of the manufacturing technology for anchors is presented in the paper. Evaluation of applicability of various materials for anchors, as well as analysis of the influence of process parameters on the in use properties of product, were the objectives of the research. In the material part, bainitic steels were considered as an alternative for the commonly used C-Mn steels. Possibility of elimination of the heat treatment was evaluated. Rheological models for the investigated steels were developed and implemented into the finite element code for simulations of drawing and multi stage forging. Criteria for the selection of the best manufacturing chain composed dimensional accuracy, tool life and product properties. Industrial trials were performed for the selected cycle and the efficiency of this cycle was evaluated. Finally, simulations of the in use behaviour of the anchor-concrete joint were performed. On the basis of the simulations the optimization task using strength of the joint as the objective function was formulated

Optimization of a Tire Traction Model for Antilock Brake System Simulations

1995 ◽  
Vol 117 (2) ◽  
pp. 199-204 ◽  
Author(s):  
J. R. Wagner
Keyword(s):  
Computer Aided Design ◽  
Cost Effective ◽  
Shear Forces ◽  
Data Simulation ◽  
Antilock Brake System ◽  
Road Surfaces ◽  
System Variables ◽  
The Cost ◽  
Aided Design ◽  
Selection Of

The cost effective design of antilock brake systems for automobiles requires the use of computer aided design and analysis techniques, as well as traditional invehicle testing. An important consideration in the simulation of the vehicle and brake dynamics is the generation of the shear forces and aligning torques at the tire/road interface. Frequently, experimental tire data gathered over a limited number of road surfaces is extrapolated to test antilock brake systems on a variety of roads. However, this approach may lead to problems in correlating the simulated system performance with actual vehicle tests. In this study, nonlinear programming strategies are applied to an analytical tire model to facilitate the selection of system variables. The formulation of an optimization problem to determine these variables permits the generation of shear forces which correspond fairly well with the empirical data. Simulation results are presented and discussed for five road surfaces to indicate the overall performance of this technique.

scholarly journals Resistive Force Calculation and Battery Pack Configuration using Simulink Model

2020 ◽  
Vol 9 (8) ◽  
pp. 464-469
Keyword(s):  
Computer Aided Design ◽  
Individual Cell ◽  
Battery Pack ◽  
Resistance Force ◽  
Performance Parameters ◽  
Simulink Model ◽  
Two Wheeler ◽  
Aided Design ◽  
Force Calculation ◽  
Selection Of

This paper provides a step by step guide for calculation of powertrain unit including the configuration of battery pack of a two-wheeler electric vehicle. Based on the design and desired performance of the vehicle, the total resistance force, torque and power is calculated and designed in MATLAB and Simulink, which is essential for selection of electric motor. Knowing the voltage and capacity of an individual cell the configuration of battery pack is calculated and depicted in SOLIDWORKS Computer Aided Design model. A website is developed which is competent to perform the necessary calculations and display the output of the desired performance parameters.

The Application of a Computer-Aided Design Technique to the Conceptual Design of Turbochargers: Part B — Radial Turbine Design

1996 ◽  
Author(s):  
A. Whitfield ◽  
Abu Hasan Abdullah
Keyword(s):  
Computer Aided Design ◽  
Mechanical Efficiency ◽  
Stagnation Temperature ◽  
Power Requirement ◽  
Compressor Inlet ◽  
Turbine Design ◽  
Aided Design ◽  
Graphical Presentation ◽  
Stage Efficiency ◽  
Selection Of

A procedure similar to that presented in Part A is described for the non-dimensional design of radial inflow turbines. The technique is developed non-dimensionally to provide the overall dimensions, including the leading and trailing edge blade angles, of radial flow turbine rotors. Consideration of the adoption of non-radial blades at rotor inlet, leading to mixed flow rotors, and discharge swirl is included. The procedure is developed from a knowledge of the non-dimensional power requirement which is derived through the turbocharger matching conditions. To satisfy the matching requirement the mechanical efficiency of the turbocharger, the air fuel ratio, the inlet stagnation temperature relative to that at compressor inlet, and the gas constants for the hot exhaust gas must be specified. In addition a target stage efficiency, on a total to static basis, must be specified. In essence the procedure provides graphically all the possible velocity vectors at rotor inlet and exhaust. The graphical presentation allows the designer to survey all the options available; as this is done relevant data is presented and continuously up-dated to aid in the selection of the preferred design conditions. The non-dimensional geometry of the rotor is then developed from which the absolute dimensions can be derived through the specification of the gas mass flow rate and the inlet stagnation conditions.

scholarly journals The Method of Selecting Protection Devices in the Automated Design of an Electrical Complex of a Transport Vehicle

2021 ◽  
Vol 2096 (1) ◽  
pp. 012201
Author(s):  
E Fedorov ◽  
A Ferenets ◽  
A Mingazov
Keyword(s):  
Computer Aided Design ◽  
Short Circuit ◽  
Correct Choice ◽  
Correct Selection ◽  
Software Module ◽  
Transport Vehicle ◽  
Protection Devices ◽  
Aided Design ◽  
Short Circuit Currents ◽  
Selection Of

Abstract The article describes the mathematical and software module of computer-aided design of vehicle electric systems: selection and verification of protective devices. The following problems are solved: calculation of currents in the circuit sections of scheme for normal and directive modes taking into account the changes in the current distribution as to the modes of consumption, calculation of the currents in the circuit sections of design scheme for short-circuit modes, checking the correct choice of protection devices as to the rated current, checking the correct selection of protection device in overloads in case of electric motor loads, determining the sequence of triggering of protection devices in the modes of short-circuit and checking the selectivity of protection, checking the protection devices for resistance to short-circuit currents

Meta-Morphological Technique for a Multi-Parameter Design Index

1993 ◽  
Vol 8 (4) ◽  
pp. 241-249
Author(s):  
Haresh Lalvani
Keyword(s):  
Computer Aided Design ◽  
Dimensional Space ◽  
Composite Index ◽  
Pythagorean Theorem ◽  
Design Problems ◽  
Multiple Parameters ◽  
Candidate Solution ◽  
Complex Design ◽  
Aided Design ◽  
Selection Of

Complex design and morphologic problems, consisting of multiple parameters, can be described, modelled and indexed using a meta-morphological technique presented here. All design and morphologic variables can be mapped in Euclidean n-dimensional space, where n is the number of variables. This meta-space contains all the possible solutions to the problem and each point in this solution n-space is a candidate solution. The desired solution, represented by a specific point in this space and coded (addressed) by its n-dimension Cartesian co-ordinates, is ranked by the hyper-distance of this point from the origin. The hyper-distance itself provides a design index (or hyper-index) of the solution and can be determined by the known hyper-Pythagorean theorem. The procedure is recursive and applies to complex design problems which are hierarchical and composed of problem-within-problem-within-problems. Here the parameters are composed of subparameters, and the solutions are correspondingly mapped in a recursive, fractal n-cube composed of sub-cubes composed of sub-sub-cubes. The total composite index is determined by the recursive application of the hyper-Pythagorean theorem and represents a quantification of the morphological complexity of the design. The model is independent of the design problem, and has attractive possibilities for application in computer-aided design environments. The application is shown with the hypothetical selection of a space frame from a number of alternatives.

Precision Manufacturing Process of Parts Realized by FDM Rapid Prototyping

2013 ◽  
Vol 581 ◽  
pp. 292-297 ◽  
Author(s):  
Ludmila Novakova-Marcincinova ◽  
Jozef Novak-Marcincin ◽  
Miroslav Janak
Keyword(s):  
Rapid Prototyping ◽  
Computer Aided Design ◽  
Three Dimensional ◽  
Scale Model ◽  
Fused Deposition Modelling ◽  
Fused Deposition ◽  
Technology Preparation ◽  
Basic Characteristics ◽  
Aided Design ◽  
Selection Of

Rapid Prototyping (RP) can be defined as a group of techniques used to quickly fabricate a scale model of a part or assembly using three-dimensional computer aided design (CAD) data. What is commonly considered to be the first RP technique, Stereolithography, was developed by 3D Systems of Valencia, CA, USA. In this contribution are presented basic characteristics and problems in area of technology of Rapid Prototyping with use of Fused Deposition Modelling. It belongs to methods of precision model creation based on geometry obtained from CAD environment. Chapters are focused on optimization of FDM technology preparation process with aim of maximal precision of the parts. There also is algorithm that leads to selection of suitable settings for these problems. There are outputs in form of graph and tables accumulating information directly affecting precision aspects of manufacturing.

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